pmpro_test_activity_email.php

<?php

/**
 * Trigger admin activity email.
 *
 * To send a test email, go to yoursite.com/?test_admin_activity_email=1
 */
function pmpro_test_activity_email() {
	if ( ! empty( $_REQUEST['test_admin_activity_email'] ) ) {
		$email = new PMPro_Admin_Activity_Email;
		$email->sendAdminActivity();
	}
}
add_action('init', 'pmpro_test_activity_email');